I think that Trial of execution is the easyest out of them, theres 4 waves of mobs with 4 mobs per wave, kill mobs before the executer gets to the stage, it is fairly simple and easy, need a decent group, with at least 5-6k warrior
Dps needs to be good or you wont make it, i would get a enc to mez, or have cleric kite the other 3 around after he gets argo from frist Ch, either works the mobs dont hit too hard, maybe 200 250 max